Diffmate

What it does

Free browser tool to compare CSV, Excel, PDF & text files. No install, no signup, files never leave your device. Drop two files and see every change highlighted side by side. Handles million-row files without freezing, powered by a Web Worker diff engine. Added, modified, and deleted lines are color-coded for instant review.

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  csvdiff.appJul 2026 · csvdiff.app · ▲9

  Compare CSV files. Right in your browser

• CA
  csvdiff – a fast diff tool for comparing CSV files2019 · github.com · ▲21
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  Compare2excelJul 2026 · compare2excel.com · ▲3

  Compare Two Excel Files online Free

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  Compare, merge and split messy files in seconds.

• 
  SheetRowsFeb 2026 · ▲2

  100% Free Private Excel tools | Zero data leaves your device

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  DiffractJun 2026 · getdiffract.com · ▲5

  The modern diff tool you always wanted.

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